I recently replied to an online discussion in which the Landmark Forum came up, to provide some information from my own research. I'm re-posting that reply here for anyone who may find it useful.

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​The Landmark Forum presents itself as a businesslike self-help program, but that is a veneer for a cult left over from the 1970s. They employ cult techniques such as group pressure tactics (including public ridicule and shaming to break people down), insider technical jargon, and hypnosis without notice or consent. Here is an expose about the con-man who founded it, Werner Erhard, which has been suppressed but is available through Wikileaks. (Because the Forum rakes in *a lot* of money, they have an army of lawyers to suppress and counteract negative/critical publicity.)

The Landmark Forum is particularly notorious for destroying marriages. Ask any older, experienced psychotherapist, who will have dealt with many clients whose psychology and relationships were harmed by the Forum. Here's one example from the many complaints online:

"My wife has totally disconnected and filed for separation. Sure I've been less than perfect. I admitted everything I did and she will not even talk to me. She kicked me out of my house and away from my two babies. The only thing that is different with her is she has been doing Landmark Forum for the last few months. Is there anyone out there who has gone through the same thing? We have been together for 14 years and she has totally become another person who is not even talking to me. I feel like I am talking to a robot !!"

https://au.answers.yahoo.com/question/index?qid=20100205175947AA7qIjU​The Forum finds vulnerable people, exploits their insecurities, and drills in the Landmark/EST/Werner Erhard cult mentality. Their ideas are Kantian "create the reality you want by thinking it" BS. It is one of the offshoots of Scientology. It destroys people and is pure, deadly evil.